PE Quiz 4

In a single-phase voltage source inverter operating in 120° mode, each thyristor conducts for:

• 60°

• 90°

• 120°

• 180°

In 120° conduction mode of three-phase inverter, the number of switches conducting simultaneously is:

• 1

• 2

• 3

• 4

The frequency of the triangular carrier wave in SPWM should be:

• Equal to reference frequency

• Lower than reference frequency

• Much higher than reference frequency

• Half of reference frequency

Modified Sinusoidal PWM differs from conventional SPWM by:

• Using square wave reference

• Injecting third harmonic to reference

• Using multiple carriers

• Eliminating carrier wave

In Space Vector Modulation (SVM), the number of switching states possible in a three-phase inverter is:

• 6

• 8

• 12

• 16

In SVM, the zero vectors are:

• V1 and V6

• V0 and V7

• V2 and V5

• V3 and V4

The voltage space is divided into how many sectors in SVM?

• 3

• 4

• 6

• 8

The main advantage of SVM over SPWM is:

• Simpler to implement

• Better DC bus utilization and reduced harmonics

• Lower cost

• No switching losses

In induction heating applications, inverters typically operate at:

• 50-60 Hz

• 500 Hz - 1 kHz

• High frequency (1 kHz - 1 MHz)

• DC

What is the function of an inverter?

• Charge the battery

• Convert DC from battery to AC for load

• Regulate input voltage

• Filter harmonics